Extruded noodle and die piece for extruded noodle

Abstract

Disclosed is an extruded noodle having a hole extending therethrough in a longitudinal direction, wherein: the hole closes or contracts during boiling or rehydration in hot water; and the hole in a cross section of the noodle is configured such that a plurality of grooves are formed rotationally symmetrically about a center of the cross section, extending in an outer radial direction from the center of the cross section of the noodle.

The invention claimed is: 
     
       1. An extruded noodle having a hole extending therethrough in a longitudinal direction, wherein:
 wheat flour is essential as a raw material for the noodle; 
 the hole closes or contracts during boiling or rehydration in hot water; 
 the hole in a cross section of the noodle is configured such that a plurality of grooves are formed rotationally symmetrically about a center of the cross section, extending in an outer radial direction from the center of the cross section of the noodle; 
 the hole having an air gap at the center of the cross-section of the noodle, wherein the plurality of grooves are located adjacent to each other in a circumferential direction of the noodle and are within the noodle, and further wherein the plurality of grooves open to the center of the cross section of the noodle to form the air gap; and 
 the hole closes during boiling or rehydration in hot water, or contracts to such an extent as to allow the grooves excluding the air gap to be closed. 
 
     
     
       2. The extruded noodle according to  claim 1 , wherein the hole is formed so as to occupy 2% to 15% of a sectional area of the noodle including the hole. 
     
     
       3. The extruded noodle according to  claim 1 , wherein tips of the plurality of grooves reach positions 30% to 70% of a distance from the center of the cross section of the noodle to an outer peripheral edge of the noodle. 
     
     
       4. The extruded noodle according to  claim 1 , wherein the hole in the cross section of the noodle is shaped to have a depressed portion which is located between tips of adjacent ones of the plurality of grooves and is recessed toward the center of the cross section of the noodle. 
     
     
       5. The extruded noodle according to  claim 1 , wherein tips of the plurality of grooves have a curved surface. 
     
     
       6. The extruded noodle according to  claim 1 , wherein the groove has a width decreasing toward the radially outward side.